Revert "[fix](tgt)hadoop kerberos support renew TGT by keytab (#173)" but remain principal interface #298
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Revert #173 but keep
hdfsBuilderSetPrincipal()in hdfs.h.We can not only use
hdfsBuilderSetUsername()to set principal. If user is set, theUserGroupInformation.getBestUGI()will try getting ugi from remote user, not from kerberos subject.